/** $Id: DrvVD.cpp 4071 2007-08-07 17:07:59Z vboxsync $ */ /** @file * * VBox storage devices: * Media implementation for VBox disk container */ /* * Copyright (C) 2006-2007 innotek GmbH * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License as published by the Free Software Foundation, * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE * distribution. VirtualBox OSE is distributed in the hope that it will * be useful, but WITHOUT ANY WARRANTY of any kind. */ /******************************************************************************* * Header files * *******************************************************************************/ #define LOG_GROUP LOG_GROUP_DRV_VD #include #include #include #include #include #include #include #include "Builtins.h" /******************************************************************************* * Defined types, constants and macros * *******************************************************************************/ /** Converts a pointer to VDIDISK::IMedia to a PVBOXDISK. */ #define PDMIMEDIA_2_VBOXDISK(pInterface) \ ( (PVBOXDISK)((uintptr_t)pInterface - RT_OFFSETOF(VBOXDISK, IMedia)) ) /** Converts a pointer to PDMDRVINS::IBase to a PPDMDRVINS. */ #define PDMIBASE_2_DRVINS(pInterface) \ ( (PPDMDRVINS)((uintptr_t)pInterface - RT_OFFSETOF(PDMDRVINS, IBase)) ) /** Converts a pointer to PDMDRVINS::IBase to a PVBOXDISK. */ #define PDMIBASE_2_VBOXDISK(pInterface) \ ( PDMINS2DATA(PDMIBASE_2_DRVINS(pInterface), PVBOXDISK) ) /** * VBox disk container media main structure, private part. */ typedef struct VBOXDISK { /** The VBox disk container. */ PVBOXHDD pDisk; /** The media interface. */ PDMIMEDIA IMedia; /** Pointer to the driver instance. */ PPDMDRVINS pDrvIns; /** Name of the image format backend. */ char szFormat[16]; /** Flag whether suspend has changed image open mode to read only. */ bool fTempReadOnly; } VBOXDISK, *PVBOXDISK; /******************************************************************************* * Error reporting callback * *******************************************************************************/ static void vdErrorCallback(void *pvUser, int rc, RT_SRC_POS_DECL, const char *pszFormat, va_list va) { PPDMDRVINS pDrvIns = (PPDMDRVINS)pvUser; pDrvIns->pDrvHlp->pfnVMSetErrorV(pDrvIns, rc, RT_SRC_POS_ARGS, pszFormat, va); } /******************************************************************************* * Media interface methods * *******************************************************************************/ /** @copydoc PDMIMEDIA::pfnRead */ static DECLCALLBACK(int) vdRead(PPDMIMEDIA pInterface, uint64_t off, void *pvBuf, size_t cbRead) { LogFlow(("%s: off=%#llx pvBuf=%p cbRead=%d\n", __FUNCTION__, off, pvBuf, cbRead)); PVBOXDISK pData = PDMIMEDIA_2_VBOXDISK(pInterface); int rc = VDRead(pData->pDisk, off, pvBuf, cbRead); if (VBOX_SUCCESS(rc)) Log2(("%s: off=%#llx pvBuf=%p cbRead=%d %.*Vhxd\n", __FUNCTION__, off, pvBuf, cbRead, cbRead, pvBuf)); LogFlow(("%s: returns %Vrc\n", __FUNCTION__, rc)); return rc; } /** @copydoc PDMIMEDIA::pfnWrite */ static DECLCALLBACK(int) vdWrite(PPDMIMEDIA pInterface, uint64_t off, const void *pvBuf, size_t cbWrite) { LogFlow(("%s: off=%#llx pvBuf=%p cbWrite=%d\n", __FUNCTION__, off, pvBuf, cbWrite)); PVBOXDISK pData = PDMIMEDIA_2_VBOXDISK(pInterface); Log2(("%s: off=%#llx pvBuf=%p cbWrite=%d %.*Vhxd\n", __FUNCTION__, off, pvBuf, cbWrite, cbWrite, pvBuf)); int rc = VDWrite(pData->pDisk, off, pvBuf, cbWrite); LogFlow(("%s: returns %Vrc\n", __FUNCTION__, rc)); return rc; } /** @copydoc PDMIMEDIA::pfnFlush */ static DECLCALLBACK(int) vdFlush(PPDMIMEDIA pInterface) { LogFlow(("%s:\n", __FUNCTION__)); PVBOXDISK pData = PDMIMEDIA_2_VBOXDISK(pInterface); int rc = VDFlush(pData->pDisk); LogFlow(("%s: returns %Vrc\n", __FUNCTION__, rc)); return rc; } /** @copydoc PDMIMEDIA::pfnGetSize */ static DECLCALLBACK(uint64_t) vdGetSize(PPDMIMEDIA pInterface) { LogFlow(("%s:\n", __FUNCTION__)); PVBOXDISK pData = PDMIMEDIA_2_VBOXDISK(pInterface); uint64_t cb = VDGetSize(pData->pDisk); LogFlow(("%s: returns %#llx (%llu)\n", __FUNCTION__, cb, cb)); return cb; } /** @copydoc PDMIMEDIA::pfnIsReadOnly */ static DECLCALLBACK(bool) vdIsReadOnly(PPDMIMEDIA pInterface) { LogFlow(("%s:\n", __FUNCTION__)); PVBOXDISK pData = PDMIMEDIA_2_VBOXDISK(pInterface); bool f = VDIsReadOnly(pData->pDisk); LogFlow(("%s: returns %d\n", __FUNCTION__, f)); return f; } /** @copydoc PDMIMEDIA::pfnBiosGetGeometry */ static DECLCALLBACK(int) vdBiosGetGeometry(PPDMIMEDIA pInterface, uint32_t *pcCylinders, uint32_t *pcHeads, uint32_t *pcSectors) { LogFlow(("%s:\n", __FUNCTION__)); PVBOXDISK pData = PDMIMEDIA_2_VBOXDISK(pInterface); int rc = VDGetGeometry(pData->pDisk, pcCylinders, pcHeads, pcSectors); if (VBOX_FAILURE(rc)) { Log(("%s: geometry not available.\n", __FUNCTION__)); rc = VERR_PDM_GEOMETRY_NOT_SET; } LogFlow(("%s: returns %Vrc (CHS=%d/%d/%d)\n", __FUNCTION__, rc, *pcCylinders, *pcHeads, *pcSectors)); return rc; } /** @copydoc PDMIMEDIA::pfnBiosSetGeometry */ static DECLCALLBACK(int) vdBiosSetGeometry(PPDMIMEDIA pInterface, uint32_t cCylinders, uint32_t cHeads, uint32_t cSectors) { LogFlow(("%s: CHS=%d/%d/%d\n", __FUNCTION__, cCylinders, cHeads, cSectors)); PVBOXDISK pData = PDMIMEDIA_2_VBOXDISK(pInterface); int rc = VDSetGeometry(pData->pDisk, cCylinders, cHeads, cSectors); LogFlow(("%s: returns %Vrc\n", __FUNCTION__, rc)); return rc; } /** @copydoc PDMIMEDIA::pfnBiosGetTranslation */ static DECLCALLBACK(int) vdBiosGetTranslation(PPDMIMEDIA pInterface, PPDMBIOSTRANSLATION penmTranslation) { LogFlow(("%s:\n", __FUNCTION__)); PVBOXDISK pData = PDMIMEDIA_2_VBOXDISK(pInterface); int rc = VDGetTranslation(pData->pDisk, penmTranslation); LogFlow(("%s: returns %Vrc (%d)\n", __FUNCTION__, rc, *penmTranslation)); return rc; } /** @copydoc PDMIMEDIA::pfnBiosSetTranslation */ static DECLCALLBACK(int) vdBiosSetTranslation(PPDMIMEDIA pInterface, PDMBIOSTRANSLATION enmTranslation) { LogFlow(("%s:\n", __FUNCTION__)); PVBOXDISK pData = PDMIMEDIA_2_VBOXDISK(pInterface); int rc = VDSetTranslation(pData->pDisk, enmTranslation); LogFlow(("%s: returns %Vrc (%d)\n", __FUNCTION__, rc, enmTranslation)); return rc; } /** @copydoc PDMIMEDIA::pfnGetUuid */ static DECLCALLBACK(int) vdGetUuid(PPDMIMEDIA pInterface, PRTUUID pUuid) { LogFlow(("%s:\n", __FUNCTION__)); PVBOXDISK pData = PDMIMEDIA_2_VBOXDISK(pInterface); int rc = VDGetUuid(pData->pDisk, 0, pUuid); LogFlow(("%s: returns %Vrc ({%Vuuid})\n", __FUNCTION__, rc, pUuid)); return rc; } /******************************************************************************* * Base interface methods * *******************************************************************************/ /** @copydoc PDMIBASE::pfnQueryInterface */ static DECLCALLBACK(void *) vdQueryInterface(PPDMIBASE pInterface, PDMINTERFACE enmInterface) { PPDMDRVINS pDrvIns = PDMIBASE_2_DRVINS(pInterface); PVBOXDISK pData = PDMINS2DATA(pDrvIns, PVBOXDISK); switch (enmInterface) { case PDMINTERFACE_BASE: return &pDrvIns->IBase; case PDMINTERFACE_MEDIA: return &pData->IMedia; default: return NULL; } } /******************************************************************************* * Driver methods * *******************************************************************************/ /** * Construct a VBox disk media driver instance. * * @returns VBox status. * @param pDrvIns The driver instance data. * If the registration structure is needed, pDrvIns->pDrvReg points to it. * @param pCfgHandle Configuration node handle for the driver. Use this to obtain the configuration * of the driver instance. It's also found in pDrvIns->pCfgHandle as it's expected * to be used frequently in this function. */ static DECLCALLBACK(int) vdConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfgHandle) { LogFlow(("%s:\n", __FUNCTION__)); PVBOXDISK pData = PDMINS2DATA(pDrvIns, PVBOXDISK); int rc = VINF_SUCCESS; char *pszName; /**< The path of the disk image file. */ bool fReadOnly; /**< True if the media is readonly. */ bool fHonorZeroWrites; /**< True if zero blocks should be written. */ /* * Init the static parts. */ pDrvIns->IBase.pfnQueryInterface = vdQueryInterface; pData->pDrvIns = pDrvIns; pData->fTempReadOnly = false; /* IMedia */ pData->IMedia.pfnRead = vdRead; pData->IMedia.pfnWrite = vdWrite; pData->IMedia.pfnFlush = vdFlush; pData->IMedia.pfnGetSize = vdGetSize; pData->IMedia.pfnIsReadOnly = vdIsReadOnly; pData->IMedia.pfnBiosGetGeometry = vdBiosGetGeometry; pData->IMedia.pfnBiosSetGeometry = vdBiosSetGeometry; pData->IMedia.pfnBiosGetTranslation = vdBiosGetTranslation; pData->IMedia.pfnBiosSetTranslation = vdBiosSetTranslation; pData->IMedia.pfnGetUuid = vdGetUuid; /* * Validate configuration and find all parent images. * It's sort of up side down from the image dependency tree. */ unsigned iLevel = 0; PCFGMNODE pCurNode = pCfgHandle; for (;;) { bool fValid; if (pCurNode == pCfgHandle) { /* Toplevel configuration contains the format backend name and * full image open information. */ fValid = CFGMR3AreValuesValid(pCurNode, "Format\0" "Path\0ReadOnly\0HonorZeroWrites\0"); } else { /* All other image configurations only contain image name. */ fValid = CFGMR3AreValuesValid(pCurNode, "Path\0"); } if (!fValid) { rc = PDMDrvHlpVMSetError(pDrvIns, VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES, RT_SRC_POS, N_("DrvVD: Configuration error: keys incorrect at level %d"), iLevel); break; } PCFGMNODE pParent = CFGMR3GetChild(pCurNode, "Parent"); if (!pParent) break; pCurNode = pParent; iLevel++; } /* * Open the images. */ if (VBOX_SUCCESS(rc)) { rc = CFGMR3QueryString(pCfgHandle, "Format", &pData->szFormat[0], sizeof(pData->szFormat)); if (rc == VERR_CFGM_VALUE_NOT_FOUND) { /* Default disk image format is VMDK. */ rc = VINF_SUCCESS; strncpy(&pData->szFormat[0], "VMDK", sizeof(pData->szFormat)); pData->szFormat[sizeof(pData->szFormat) - 1] = '\0'; } if (VBOX_SUCCESS(rc)) { rc = VDCreate(pData->szFormat, vdErrorCallback, pDrvIns, &pData->pDisk); /* Error message is already set correctly. */ } else rc = PDMDRV_SET_ERROR(pDrvIns, rc, N_("DrvVD: Configuration error: Querying \"Format\" as string failed")); } while (pCurNode && VBOX_SUCCESS(rc)) { /* * Read the image configuration. */ rc = CFGMR3QueryStringAlloc(pCurNode, "Path", &pszName); if (VBOX_FAILURE(rc)) { VDDestroy(pData->pDisk); rc = PDMDRV_SET_ERROR(pDrvIns, rc, N_("DrvVD: Configuration error: Querying \"Path\" as string failed")); break; } if (iLevel == 0) { rc = CFGMR3QueryBool(pCurNode, "ReadOnly", &fReadOnly); if (rc == VERR_CFGM_VALUE_NOT_FOUND) fReadOnly = false; else if (VBOX_FAILURE(rc)) { MMR3HeapFree(pszName); VDDestroy(pData->pDisk); rc = PDMDRV_SET_ERROR(pDrvIns, rc, N_("DrvVD: Configuration error: Querying \"ReadOnly\" as boolean failed")); break; } rc = CFGMR3QueryBool(pCfgHandle, "HonorZeroWrites", &fHonorZeroWrites); if (rc == VERR_CFGM_VALUE_NOT_FOUND) fHonorZeroWrites = false; else if (VBOX_FAILURE(rc)) { MMR3HeapFree(pszName); VDDestroy(pData->pDisk); rc = PDMDRV_SET_ERROR(pDrvIns, rc, N_("DrvVD: Configuration error: Querying \"HonorZeroWrites\" as boolean failed")); break; } } else { fReadOnly = true; fHonorZeroWrites = false; } /* * Open the image. */ unsigned uOpenFlags; if (fReadOnly) uOpenFlags = VD_OPEN_FLAGS_READONLY; else uOpenFlags = VD_OPEN_FLAGS_NORMAL; if (fHonorZeroWrites) uOpenFlags |= VD_OPEN_FLAGS_HONOR_ZEROES; rc = VDOpen(pData->pDisk, pszName, uOpenFlags); if (VBOX_SUCCESS(rc)) Log(("%s: %d - Opened '%s' in %s mode\n", __FUNCTION__, iLevel, pszName, VDIsReadOnly(pData->pDisk) ? "read-only" : "read-write")); else { AssertMsgFailed(("Failed to open image '%s' rc=%Vrc\n", pszName, rc)); VDDestroy(pData->pDisk); break; } MMR3HeapFree(pszName); /* next */ iLevel--; pCurNode = CFGMR3GetParent(pCurNode); } LogFlow(("%s: returns %Vrc\n", __FUNCTION__, rc)); return rc; } /** * Destruct a driver instance. * * Most VM resources are freed by the VM. This callback is provided so that any non-VM * resources can be freed correctly. * * @param pDrvIns The driver instance data. */ static DECLCALLBACK(void) vdDestruct(PPDMDRVINS pDrvIns) { LogFlow(("%s:\n", __FUNCTION__)); PVBOXDISK pData = PDMINS2DATA(pDrvIns, PVBOXDISK); int rc = VDCloseAll(pData->pDisk); AssertRC(rc); } /** * When the VM has been suspended we'll change the image mode to read-only * so that main and others can read the VDIs. This is important when * saving state and so forth. * * @param pDrvIns The driver instance data. */ static DECLCALLBACK(void) vdSuspend(PPDMDRVINS pDrvIns) { LogFlow(("%s:\n", __FUNCTION__)); PVBOXDISK pData = PDMINS2DATA(pDrvIns, PVBOXDISK); if (!VDIsReadOnly(pData->pDisk)) { unsigned uOpenFlags; int rc = VDGetOpenFlags(pData->pDisk, &uOpenFlags); AssertRC(rc); uOpenFlags |= VD_OPEN_FLAGS_READONLY; rc = VDSetOpenFlags(pData->pDisk, uOpenFlags); AssertRC(rc); pData->fTempReadOnly = true; } } /** * Before the VM resumes we'll have to undo the read-only mode change * done in vdSuspend. * * @param pDrvIns The driver instance data. */ static DECLCALLBACK(void) vdResume(PPDMDRVINS pDrvIns) { LogFlow(("%s:\n", __FUNCTION__)); PVBOXDISK pData = PDMINS2DATA(pDrvIns, PVBOXDISK); if (pData->fTempReadOnly) { unsigned uOpenFlags; int rc = VDGetOpenFlags(pData->pDisk, &uOpenFlags); AssertRC(rc); uOpenFlags &= ~VD_OPEN_FLAGS_READONLY; rc = VDSetOpenFlags(pData->pDisk, uOpenFlags); AssertRC(rc); pData->fTempReadOnly = false; } } /** * VBox disk container media driver registration record. */ const PDMDRVREG g_DrvVD = { /* u32Version */ PDM_DRVREG_VERSION, /* szDriverName */ "VD", /* pszDescription */ "Generic VBox disk media driver.", /* fFlags */ PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT, /* fClass. */ PDM_DRVREG_CLASS_MEDIA, /* cMaxInstances */ ~0, /* cbInstance */ sizeof(VBOXDISK), /* pfnConstruct */ vdConstruct, /* pfnDestruct */ vdDestruct, /* pfnIOCtl */ NULL, /* pfnPowerOn */ NULL, /* pfnReset */ NULL, /* pfnSuspend */ vdSuspend, /* pfnResume */ vdResume, /* pfnDetach */ NULL };